Arrestment



June 25, 1929. E, UHER, JR 1,718,615

ARRE S TMENT Filed Feb. 4, 1927 1 N'V E NTOR: Edmund UeJg BY; .74 62%. Kuba Patented J une 25, 1929.

UNITED STATES EDMUND UHER, JR., 0F BUDAPEST, HUNGARY.

ARRESTMEN T.

Application led February 4, 1927, Serial No. 165,996, and in Germany January 4, 1327,

This invention concerns an arrestment, controllcd' by an electric keyboard and electroiiiagnets, for stopping a continuously driven friction disc or the like at selected stopping points in the circle of rotation. The invention provides a solution of the problem of arresting a rotating device at predetermined points, without stopping its continuous drive, and locking and adjusting it in a smooth manner by means of a claw-coupling.

An embodiment of the invention is illustrated, diagran'imatically and by way of example, in the accompanying drawings in association with a composing device which forms the subject of my copending4 application No.

165,995. Fig. 1 is a vertical cross section through the device. Fig. 2 is a similar view of the mirror showing one half of an axially resilient claw-coupling. Fig. 3 is a plan view from below of a part of the ring of arresting contacts and Fig. 4 is a detail view ofthe cla wcoupling in the engaged position.

The device for composing photographic prints, which forms no part of the present invention consists of an ob 'ective lens 2 mounted in a telescopic tube 1 an a composing surface 3 upon which the light-sensitive plate is exposed.

The matrices are arranged in rings 51, 52, 53 around the interior of a. glass drum 4 and are illuminated by an annular lamp 6 from which the light passes by way of a small tube 7 onto the inclined miiror 8 and through the objective 2 onto the composing surface 3. It is merely necessary to rotate the mirror 8 toget-lier with the tube 7 and casing 9 in order to locate any particular character desired on the circumference of a ring, say 52, and project the same onto the composing surface. According to the present invention this is effected in the following manner A small electric motor 10 drives` through a gear 11. a `friction disc 12 which is keyed to a sleeve 13 in such a manner as to allow the latter to move longitudinally relatively thereto.

The said sleeve terminates in a ring 14 which is adapted to co-operate with a friction disc 15 connected to the mirror casing 9. The motor 10 thus ultimately drives continuously the casing 9 together with the mirror 8 and tube 7, these members running on ball bearings 16, 17. To arrest the mirror 8 a braking disc 18 is employed which is actuated through the shaft 19 by the electromagnet 20 and leaf spring 21.

f Fig. 1 illustrates the braking disc in the lifted position, in which it allows the casing to rotate freely. Immediately the magnet 2() is excited however, it draws the shaft 19 and brakes the discs 15. First of the `said magnet draws the sleeve 13 upwardly so that the drive of the disc 15 is discontinued before the braking thereof is effected.

The following provision is made to ensure thewilisc 15 and tube 7 being arrested precisely in the desired position:

The disc 15 supports a brush 22 which runs on contacts 23 (Fig. embedded in an insulating ring 42. A separate contact 23 is provided for each character on the circumference of the ring 52. The exciting current is carried from a battery 24 by way of a conductor 25 di` rectly to the magnets 20 and thence by way of the metal of the machine to the brush 22. The circuit through any Contact 23 is completed by separate branch leads each of which has an interruption 27 controlled by a key 26. It is only necessary to press down the selected key 26 and the magnet 2G will, immediately the rotating brush 22 registers with the corresponding contact 23, be excited and the ring 14 moinentarily raised while the braking disc 18 is lowered.

A claw-coupling 28, 29, which has as many teeth as there are characters on the circumference 52 or contacts 23 in the ring of contacts, is provided for the fine adjustment on the stopping of the tube 7. The upper half 28 of the coupling is carried by the lower end of a sleeve 30 which is controlled by electroniagncts 32 and 7 downwardly all, however,

springs 33 which act on a disc 3l. The niagnets 32 are connected in series with the magnets 2O so that the arrestment of the disc l5 is followed by the engagement of the claw-coupling 28, 29. The lower half 29 ofthe coupling is connected with the disc 15 by screws 34 and springs 3T, the connection being somewhat resilient in the axial direction so that harmful shocks on the engagement of the coupling are avoided.

ln order to prevent dangerous jamming of the device the magnetic operations are initiated in the following order:

First the momentary disengagement of the drive on the disc 15, then the braking, and finally the tine adjustment. The two first operations are eected by the opposite poles of the magnet 2O in a mutually interdependent manner so that the operations are effected as one; since, however, the air gap between the armature of the Shaft 19 and the upper pole lio of the magnet is somewhat greater than that between the armature of the sleeve 13 and the lower pole the necessary successlon of j the operations is rendered automatic. Similarly the sleeve 30 is suitably delayed by appropriately dimensioning the gap 31, 32 or the self induction of the magnets 32 relatively to the corresponding factors of the magnets 20.

Consequently the disc 15 is braked only after it has been disengaged and 1s finely adj usted and locked in position after it has been brought to rest. Accordin to the mvention further precautions are ta en in order that the halves 28, 29, of the-coupling shall be as exactly as possible opposite to one another on the arrestment of the disc 15. Firstly the contacts 23 are disposed in two concentric rings, (Fig. 3), and secondly the rings of contacts are made adjustable about their own centre point. The irst of these measures enables the contacts 23, the number of Wh1ch, similarly to the number of teeth in the clawcoupling 28, 29, is made for the sake of precision equal to the number of characters, to be disposed at a suliicientl large angle fromone another in order that there shall be suliicient time for the operation of the magnets 20, 32, even when the disc 15 is rotated at comparatively high speed. The second measure allows of the rings of contacts being finely adjusted relatively to the ring of teeth of the claw-coupling so that gratin of the halves of the coupling 28, 29 is avoi ed and the tine adjustment proper is of hair fineness. In the example illustrated this adjustability is attained by reason of the fact that the screws 43 whereby the ring of contacts is secured to the machine casing project into circular slots 44 (Fig. 3).

The manner of operation of the described device is as follows The drum 4 carrying the rings 51, 52, 53 of characters one above the other is adjusted axially by means of a gear 36, a spring loaded pin 37 and holes 39 provided in the tubular drum-extension 38, until the desired ring is at the level of the tube 7.

The photographic composing is performed, together with the movement of the slide 3, in a manner similar to type-writing, the exposure period also being controlled from the keys 26. The rotating tube 7 stops exactly in front of the character of which the key 26 is depressed since the depression of the key closes the corresponding circuit and enables the magnets 20, 32'to be excited in the manner set forth. The sleeves 13 and 30 are, similarly to the shaft 19, spring loaded so that theys ring back into their positions of rest when t e magnets are unexcite'd.

I claim:

1. A device of the character described, comprising,` in combination, a rotatable clutch member, means for continuously driving said clutch member, a plurality of independent electrical contact members dlsposed in concentric relation to said clutch member, a brush carried by said clutch member and adapted to form contact successively with all of said contact members during the rotation of the clutch member, an electromagnet in electrical connection with said brush and with one pole of a source of electrical energy, individual means Jfor selectively placing each of said contact members in electrical connection with the other pole of said source Whereby on the operation of either of said individual means a circuit is established through said electromagnet, and means operable by said electromagnet for releasing said clutch member from said continuously driving means.

2. A device of the character described, comprising, in combination, a rotatable clutch member, means for continuously driving said clutch member, a plurality of independent electrical contact members disposed in concentric relation to said clutch member, a brush carried by said clutch member and adapted to form contact sucessively with all of said contact members during the rotation of the clutch member, an electromagnet in electrical connection with said brush and with one ole of a source of electrical energy, indivi ual means for selectively placing each of said contact members in electrical connection with the other pole of said source Whereby on the operation of either of said individual means a circuit is established through said electromagnet, means operable' by said electromagnet for releasing said clutch member from said continuously driving means, and means also operable by said electromagnet for braking said clutch member.

3. A device of the character described, comprising, in combination, a rotatable clutch member, means for continuously driving said clutch member, a plurality ot independent electrical contact members disposed in concentric relation to said clutch member, a brush carried by said clutch member and adapted to form contact successively with all of said contact members during the rotation of the clutch member, an electromagnet in electrical connection with said brush and with one pole of a source of electrical energy, individual means for selectively placing each of said contact members in electrical connection with the other pole of said source whereby on the operation of either of said individual means a. circuit is established through said electromagnet, means operable by said electromagnet for releasing said clutch member from said continuously driving means, means also operable by said electromagnet for braking said clutch member, and means brought into operation by the excitation of said electromagnet for positively retaining said clutch member at any selected point.

electrical. contact members disposed in concentric relation to said clutch member, a brush carried by said clutch member and y adapted to' form contact successively With all Alt) of said contact rmembers during the rotation of the clutch member, an electromagnet in electrical connection with said brush and with one pole of a source of electrical energy, individual means for selectively placing each otl said contact members in electrical connection with the other pole of said source Where-bv on the operation of either of said individual means a circuit is established through said electromagnet, means operable bv said electromagnet for releasing said clutch member from said continuously driving means, means also operable by said electromagnet for braking said clutch member, and means brought into operation by the excitation of said clectromagnet for positively retaining said clutch member at any selected point, said releasing means, braking means and retaining means being adapted to operate in sequence.

5. A device of the character described, comprising, in combination, a rotatable clutch member, means for continuously driving said clutch member, a plurality ot independent electrical contact members disposed in concentric relation to said clutch member, a brush carried by said clutch member and adapted to form contact successively With all of said contact members during the rotation of the clutch member, an electromagnet in electrical connection with said brush and With one pole ot a source of electrical energy, individual means tor selectively placing each of said contact members in electrical connection With the other pole ot said source whereby on the operation of either of said individual means a circuit is established through said electromagnet, means operable by said electromagnet for releasing said clutch member from said continuously driving means, and means brought into operation by the eX- citation of said electromagnct Jfor positively retaining said clutch member at any selected point.

6. A device ot the character described, com prising, in combination, a driven clutch member and a driving clutch member mounted for rotation, said clutch members being normally in engagement, means for imparting continuous rotary motion to said drivingI clutch member, an clectromagnet in electrical connection with one pole of a source of energy, selective means for establishing a circuit through said electromagnet at any one of a plurality of points during rotation of the clutch members. and an armature carried by said driving clutch member and adapted to be attracted by the electromagnet when energized thereby to cause separation of the clutch members.

7. A device ofthe character-described, comprising, in combination, a driven clutch member and a driving'clutch member mounted for rotation, said clutch members being normally in engagement, means for imparting continuous rotary motion to said driving clutch member, an electromagnet in electrical connection with one pole of a source of energy, selective means for establishing a. 'circuit through said electromagnct at any one of a plurality of points during rotation of the clutch members, an armature carried by said driving clutch member and adapted to be attracted by the electromagnet when energized thereby to cause separation of the clutch members, and means also operable by the electremagnet when energized to brake the driven clutch member.

S. A device of the character described, comprising, in combination, a driven clutch member and a driving clutch member mounted for rotation, said clutch members being normally in engagement, means for imparting continuous rotary motion to said driving clutch member, an electromagnet in electrical connection with one pole of a source of energy, selective means for establishing a circuit through said electromagnet at any one of a plurality of points during rotation of the clutch members, an armature carried by said driving clutch member and adapted to be attracted by the eleetromagnet when energized thereby to cause separation or" the clutch members, and means brought into operation by the excitation of said electromagnet for positively retaining said driven clutch member after separation of the clutch members.

9. A device of the character described, comprising, in combination, a driven clutch member and a driving clutch member mounted for rotation, said clutch members being normally in engagement, means for imparting` continuous rotary motion to said driving clutch member, an electromagnct in electrical connection with one pole of a source of energy, selective means for establishing a circuit througlr said electromagnet at any one ot a plurality of points during rotation ot the clutch members, an armature carried by said driving clutch member and adapted to be attracted by the electromagnet when energized thereby to cause separation of the clutch members, braking means normally out of Contact with said driven clutch member, and an armature carried by said braking means and adapted to be attracted by said electromagnet when energized thereby to cause the braking means to 'engage said driven clutch member subsequent to the separation of the clutch members.

l0. A device ot the character described, comprising, in combination, a driven clutch llt) member and a driving clutch member mounted for rotation, said clutch members being normally in engagement, means for imparting continuous rotary motion to said driving clutch member, an eleetromagnet in electrical connection With one pole of a source of energy, selective means for establishing a circuit through saidelectromagnet at any one of a plurality of points during rotation of the clutch members, an armature carried by said driving clutch member and adapted to be attracted by the clectromagnet When energized thereby to cause separation of the clutch members, means also operable by the electromagnet when energized to brake the driven clutch member, and means brought into operation by the excitation of said electromagnet for positively retaining said driven clutch member, the organization being such that the braking means comes into operation after the separation of the clutch.'

members and the retaining means comes into opedll'ation after the braking means has operate In testimony whereof I hereunto aix my signature this 13 day of January, 1927.

EDMUND UHER, JR. 

